Valve mechanism.



H. S. SALISBURY.

VALVE MECHANISM.

APPLICATION FILED APR. 24, 1916.

Patented Jan. 30, 1917.

HERBERT S. SALISBURY, OF WALTHATE, MASSAGHUSETTS.

VALVE MECHANISM.

Specification of Letters Patent.

lavtented Jan. 30, MP1

Application filed April 2%, 1916. Serial No. 93,085.

To all whom it may concern;

Be it known that I, HERBERT S. SALISBURY, a citizen of the United States, residing at lValtham, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Valve Mechanisms, of which the following is a specification.

This invention relates to improvements in slide valves and more especially to the type of valve embodied in an application Serial No. 43,595 previously filed by me.

The object of the invention is to provide simple and durable packing devices arranged between the face of the slide valve and its seat to prevent leakage during the compression of the charge within the compression cylinder, and also to prevent the passage of air between said valve and seatduring the forming of the vacuum therein or while the new charge is being drawn into its cylinder.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims.

Referring to the drawings: Figure 1 is a side elevation of the immediate portion of a compression cylinder surrounding one of the ports thereof with a packing member embodying my invention shown in connection therewith, a portion of the slide valve being shown in dotted lines. Fig. 2 is a section taken substantially on the line 22 ofi ig. l,

. showing the valve and the valve casing in connection therewith. Fig. 3 is a detail section taken on the line of Fig. 1, illustrating one of the resilient members for retaining the packing member in yieldingcontact with the valve. Fig. 1 is a view similar to Fig. 1, illustrating a modified form of packing member. Fig. 5 is a detail sectional view similar to Fig. 3, illustrating another form of packing member.

The present embodiment of my invention pertains particularly to valves suitable for use in connection with internal combustion engines, although the same is not essentially limited to this type of valve.

In the following embodiment in which like numerals refer to like parts throughout the several views, 5 is the casing of the engine containing the explosion cylinder 6, said cylinder having a port 7 extending preferably through the wall of the cylinder. A. slide Valve 8 preferably flatand of a sufficient width as illustrated in the dotted lines,

Fig. 1 to cover the port 7, is arranged to reciprocate against a flat surface 9 formed at the side of the casing 6 and surrounding the port 7, said flat surface constituting the seat for the valve 8. The valve 8 is preferably set into a recess 10 formed in said casing 5 with the surface 9 constituting the bottom of said recess, and a cap or plate 11 is placed over said recess and may be secured thereto in any suitable manner to completely inclose said valve. The seat 9 of the valve pro- 'ided with a groove 12 which may no rectangular, as illustrated in Fig. l or oval, as illustrated at 13, Fig. +1, said groove being endless and surrounding the port 7. A pacle ing member 13, preferably constructed of metal is arranged within said groove 12 with its outer face lit contacting with the inner face 15 of the slide valve. The packing member 13 is preferably made to nicely fit the groove 12 but in slidable relation thereto, and means, preferably springs 16, are provided to yieldingly engage the end surfaces of said packing member and maintain the same in yielding contact with the face 15 of said valve, thus preventing the passage of air or gas between the contacting faces of said valve and said packing member. To prevent the passage of gases or air around. said packing member through the recess 12, a resilient packing substance 17 has been interposed between said packing member and the bottom of the groove 12 and being resilient or somewhat elastic the pressure of air or gas against one side thereof .vrl force the same toward the opposite side and thus-cut off the passage of such air or gas through said slot.

Numerous forms of metallic packing means may be employed to facilitate the re ception of the resilient substance. In the form shown in Figs. 1, 2 and 3 the packing member is recessed entirely therearound at the outer lower corner thereof as at 18 to receive said packing substance and the springs 16 which yieldingly maintain the packing member 13 against the face of the slide valve are preferably formed of flat metal and engage the inner face of said re-- cessed portion. Each spring 16 may be bent as at 19 to form a fulcrum adjacent to the end thereof engaging the member 18 and the opposite end of said spring at 20 is arranged to engage the inner face of the cap 11, a slot 21 being provided in the casing at the desired position to contain each of said springs. lVhen the cap 11 is placed in po sition and secured to the casing the pressure upon the end 20 of said spring causes said spring to be deflected and slightly rocked upon its fulcrum 19 and thereby force the member 13 firmly against the inner face of the slide valve. A plurality of springs may be employed, as illustrated in Figs. 1 and 4, thus providing an equal or uniform pressure substantially the entire length of the packing member. The slide valve 8 has a port which, at certain times in the operation of the device, is brought into alinement with the port 7 of the casing and thereby provides communication between said cylinder and a supply or discharge pipe 23 attached to the cap plate 11. Under ordinary conditions when the explosion takes place within the cylinder (5 or the new charge is being drawn into said cylinder the port 22 will be upon the outside of the member 13 as illus trated in Figs. 1 and 2, preventing the escape of gas through said port until the proper time arrives for such to take place.

In Fig. 5 I have illustrated another form of packing member. In this form the packing member 24 may be rectangular in cross section instead of recessed as in Figs. 1 and 2, while the resilient packing substance 25 completely fills the space between said packing member 24 and the bottom 26 of the slot 27, the equivalent of the slot 12 in the forms hereinbefore described. In this form a different type of spring is employed which preferably consists of a helical spring 28 slightly smaller than the packing member 24- and arranged within a suitable recess 29.-

A large number of such springs may be arranged about the packing member 24 if desired and thus insure a uniform contact throughout the length of said packing mem ber.

Having thus specifically described my invention what I claim and desire by Letters Patent to secure is:

1. A valve mechanism comprising a slide valve, a seat for said slide valve provided with a port, said seat having a groove there in surrounding said port, a packing member arranged in said groove in yielding contact with said slide valve, and resilient means interposed between said packing member at the bottom of said groove adapted to yieldingly retain said packing member in contact with said slide valve, said resilient means being adapted to substantially fill the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

space between said packing member and the bottom of said groove to prevent leakage around said packing member.

2. A valve mechanism comprising a slide valve, a seat for said slide valve, provided with a port, said seat having a groove surrounding said port, a metallic packing member arranged in said groove, and a resilient packing substance interposed between said metallic packing member and the bottom of said groove adapted to prevent leakage around said packing member.

8. A valve mechanism comprising a slide valve, 21 seat for said slide valve provided with a port, said seat having a groove surrounding said port, a packing member arranged in said groove, said packing member having a recess extending substantially entirel y around the outer bottom corner thereof, and a resilient packing substance arranged within said recess and the bottom of said groove adapted to prevent leakage around said packing member.

i. A valve mechanism comprising a slide valve, a seat for said slide valve provided with a port, said seat having a groove surrounding said port, a packing member arranged in said groove, said packing member having a recess in the portion thereof adjacent to the bottom of said groove, and a resilient packing substance arranged Within said recess and in said groove between said packing member and the bottom of said groove adapted to prevent leakage around said packing member.

5. A valve mechanism comprising a slide valve, a seat for said slide valve provided with a port, an endless packing member surrounding said port and arranged in a groove formed in one of the contacting surfaces, means for yieldingly retaining said endless packing member in contact with the surface opposite thereto, and a resilient packing substance interposed between said packing member and the bottom of the groove con: taining the same adapted to prevent leakage around said packing member.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HERBERT s. SALISBURY.

Witnesses:

SYDNEY E. TAJFT, HATTIE E. STRATTON.

Washington, D. G. 

